- Paloservices [Athens]
- Panteion University of Social and Political Sciences
- Parallel Distributed Processing Laboratory
- Pattern Recognition & Bioinformatics Group
- Pattern Recognition Laboratory, Dept. of Computer Engineering & Informatics
- PaxLife Innovations GmbH
- Pennsylvania Commonwealth System of Higher Education (PCSHE)
- People's Friendship University of Russia [Moscow]
- Perelman School of Medicine
- Petroleum-Gas University of Ploiesti
- Pharm24
- Politecnico di Milano [Milan]
- Politecnico di Torino = Polytechnic of Turin
- Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences
- Pontifícia Universidade Católica do Rio de Janeiro [Brasil] = Pontifical Catholic University of Rio de Janeiro [Brazil] = Université catholique pontificale de Rio de Janeiro [Brésil]
- Poste Italiane Research Centre
- Pressious Arvanitidis [Chalandri]
- Prince Sultan University [Riyad]
- Project Management Department
- Purdue University [West Lafayette]
- Pusan National University